I haven't really experienced much rain now I have an ebike, but with conventional bikes I generally preferred something that was almost waterproof. Kept me a bit dry, but dried out quickly.
I might well invest in a poncho. I never had the nerve to wear one when I was younger but I am happy to say I no longer care. Seems like a great idea, far better than a boil-in-the bag plastic coat!
Oh, incidentally. For winter, I think these have a lot going for them for active movement in bad weather. VAT free as well!
The rainproof shoulders really make a difference, plus if you walk round with black trousers and a clipboard you can get free entrance to all sorts of places like art galleries. My mate got a free trip to Alton Towers once, just by looking like he was at work!